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错觉：挤出一块小空间
Author:
靳道阳
GeoGebra
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撒针估算面积实验
常见四边形是否是双心四边形
祖冲之的期望：内棋与外棋
垂直線的斜率
三角函数 的副本
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將「文字」標示在長與寬
以 Unit Circle 了解 Sine 的正/負
电荷在矩形边界磁场中运动
L形分割
愛心
Discover Topics
Unit Circle
Conditional Probability
Complex Numbers
Arithmetic Operations
Right Triangles